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Future Policy Benefits and Claims - Reconciliation of Unpaid Claims to Liability for Unpaid Claims Table (Details) - USD ($)
$ in Millions
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Future Policy Benefits and Claims        
Net outstanding liabilities for unpaid claims $ 1,399.5      
Reconciling items:        
Reinsurance recoverable on unpaid claims 35.3      
Impact of discounting (226.6)      
Loss adjustment expense liability 32.1      
Liability for unpaid claims - short duration contracts 1,240.3      
Insurance contracts other than short duration 139.6      
Liability for unpaid claims 1,379.9 $ 1,405.9 $ 1,395.0 $ 1,370.9
Long-Term Disability/Group Life Waiver        
Future Policy Benefits and Claims        
Net outstanding liabilities for unpaid claims 1,235.9      
Reconciling items:        
Reinsurance recoverable on unpaid claims 35.1      
Impact of discounting (226.6) (215.0)    
Loss adjustment expense liability 17.7      
Liability for unpaid claims - short duration contracts 1,062.1 1,082.6    
Dental, Vision, STD, Critical Illness, Accident, Hospital Indemnity and PFML        
Future Policy Benefits and Claims        
Net outstanding liabilities for unpaid claims 90.2      
Reconciling items:        
Loss adjustment expense liability 4.1      
Liability for unpaid claims - short duration contracts 94.3 83.7    
Group Life        
Future Policy Benefits and Claims        
Net outstanding liabilities for unpaid claims 73.4      
Reconciling items:        
Reinsurance recoverable on unpaid claims 0.2      
Loss adjustment expense liability 10.3      
Liability for unpaid claims - short duration contracts $ 83.9 $ 97.1